I Used 12% Fragrance Oil in a Wax Recommended for 8–10% — How Do I Calculate Exactly How Much Additional Wax I Need to Correct the Batch?

The one formula, and why it is a division

Set out the two things that are fixed and the one thing that is not. Fixed: the oil in the pot — 120 g, and no process available to a candle maker removes it. Fixed: your target load — 8%, because that is what your recipe and your product pages say. Free to change: the wax. The load is a fraction with oil on top and wax underneath, so the only move you have is to make the bottom of the fraction bigger.

The second form is the one to remember, because it turns any correction into a multiplier you can sanity-check instantly. 12 ÷ 8 = 1.5, so the wax must grow by half. 12 ÷ 10 = 1.2, so it grows by a fifth. 16 ÷ 8 = 2, so it doubles. If someone tells you a 12% batch needs 200 g of wax per kilo to reach 8%, the multiplier test kills it in two seconds: 1,200 g of wax with 120 g of oil is 10%, not 8%.

The per-kilo correction matrix

This guide's unit is the kilo, because that is what makes the arithmetic portable. Read the row for the load you actually poured, the column for the load you want, and multiply the figure by however many kilos of wax are in your pot. A 4 kg batch at 13% aiming at 8% needs 4 × 625 g = 2,500 g. Nothing else changes with scale.

Two things fall out of the matrix that are worth naming. First, the → 10% column is always the cheapest route out of trouble and it is always the one that leaves you least protected: it puts you exactly on the stated ceiling of CSI 464 and Sandalwood alike, with nothing in hand. Second, the gap between adjacent columns grows as the target falls — the step from 9% to 8% costs 167 g per kilo, the step from 8% to 6% costs 500 g. Cheap load reductions are the small ones. If you are correcting a large batch and cash matters, correct to 8% and stop; there is rarely a commercial reason to go to 6%.

The same matrix in rupees, across six waxes

Grams are only half the decision. Here is what the two most useful corrections cost per kilo of pot on every candle soy and coconut-soy wax CSI lists in stock, plus what the corrected blend costs per 200 g candle when the oil is Sandalwood at ₹5.0268 a gram.

The per-candle column is the reason a load correction is almost never a financial loss. Every candle you pour from the corrected blend costs ₹29.89 less in materials than the over-dosed version, because the expensive ingredient has been spread further. You spent ₹253.70 on wax and got three more candles at a lower unit cost. What the correction genuinely costs you is the remelt, the extra jars and wicks, and a burn test — the same three lines that appear in every rescue on this site.

When you don't have 500 g of wax spare

You have 1 kg at 12% and 200 g of plain wax in the cupboard. What now? Three honest routes, and the wrong answer is to add the 200 g and carry on calling the batch 8%.

On the third route: a slab of correctly labelled scented blend is a perfectly good ingredient. Write the wax name, the oil name, the grams of each, the load, the basis and the date on the container with a marker, and it remelts into next week's batch with no new arithmetic. What makes recovered blend worthless is never the wax — it is the missing label. That is also the difference between a batch you can correct and one you can only dilute by guesswork.

What else you just diluted: dye, additives, the wick

Adding half again as much wax does not only change the fragrance load. It changes the concentration of everything in the pot, and the two that matter commercially are colour and the wick.

Do the colour correction the same way you did the load: by calculation, with a test chip, not by squeezing dye into the pot until it looks right. CSI's liquid dyes are concentrated — one customer describes Candle Dye Liquid Purple as "concentrated color so a little amount gives the candle good pastel shade" — which cuts both ways: a small addition moves the shade a long way, and a guessed addition moves it too far. Pour a spoonful onto baking paper, let it set, and judge the chip rather than the melt, because molten wax always reads darker than the candle will.

What to buy to correct a 12% batch

Plain wax in the smallest pack that covers your addition, and the instrument that stops the next one happening. The size tables show how far each pack goes at 8% of total wax weight — 185 g of wax per 200 g candle on this convention.

The batch-sheet line that makes this a 30-second sum

Prevention, last and brief. Every correction on this page depends on one thing: knowing the oil weight. Makers who can do this sum in thirty seconds are not better at arithmetic — they simply wrote the number down.

Two mechanical habits close the loop. Tare the pot and weigh the oil into it rather than pouring from the bottle by count; most 12% accidents are a 100 g bottle emptied into a pot that wanted 80 g. And weigh the bottle before and after so the sheet records what went in rather than what was intended. Both take seconds, both cost nothing, and both are the reason the readers who never need this page never need it.

Frequently asked questions